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Shock refraction in a gas–liquid interface is ubiquitous in nature and engineering. This study investigates the shock refraction phenomena in air–water interfaces for various inclination angles. The interface inclination angles are achieved using a tiltable vertical shock tube. The time-resolved schlieren images are compared with numerical simulations performed using the BlastFoam solver in the OpenFOAM software. The stiffened gas equation of state is used to model water in the simulations. The shock polar analysis using modified shock relations for a stiffened gas is used to elucidate the refraction patterns. A regular refraction pattern with a reflected shock wave and a bound precursor refraction with a regular reflection are observed experimentally for the first time in an air–water system. Further, a new free precursor refraction pattern with a Mach reflection is observed. The transition criteria and the corresponding boundaries for each refraction pattern are demarcated in the ($M_S, \theta _w^c$)-plane. The refraction sequence and the range for various incident shock strength regimes are also identified.
Few studies investigated the association between Mediterranean-DASH Intervention for Neurodegenerative Delay (MIND) diet and metabolic health status, particularly among adolescents. The present study was designed to investigate the association of MIND diet with metabolic health status in Iranian adolescents with overweight/obesity. This cross-sectional study was done among 203 adolescents with overweight/obesity (12–18 years) in Isfahan, Iran. A validated FFQ was applied to collect dietary intakes. Anthropometric indices and blood pressure were also measured by standard procedures. Fasting blood samples were obtained to determine serum insulin, glucose and lipid profile. To categorise participants as being with metabolically healthy overweight/obesity (MHO) or metabolically unhealthy overweight/obesity (MUO), two methods including International Diabetes Federation (IDF) criteria and IDF plus Homeostasis Model Assessment of Insulin Resistance (HOMA-IR) were applied. Participants had a mean age of 13·98 years and 50·2 % of them were girls. In fully adjusted models, participants with highest MIND diet adherence had lower odds of MUO status based on IDF (OR = 0·20; 95 % CI 0·08, 0·51) and IDF/HOMA-IR (OR = 0·22; 95 % CI 0·08, 0·59) criteria. Stratified analyses revealed that this association was stronger among girls and was only significant among individuals with overweight. An inverse association was also found between MIND diet score and odds of hyperglycaemia and insulin resistance (IR). Higher MIND diet adherence was associated with lower odds MUO in adolescents with overweight/obesity. Inverse associations were also found between MIND diet and odds of hyperglycaemia and IR. Future longitudinal prospective studies are necessary to confirm our results.
In the social, historical, and political context of Xi Jinping’s China, particular forms of racialization and racial capitalism have emerged in Altay Prefecture, the homeland of ethnic Kazakhs on China’s northwest border. This study examines the husbandry industry in Altay Prefecture to elucidate how Xi’s China has built a mode of racial capitalism through the management of Kazakh land, ethnicity, and culture. Within the framework of a case study, I employ document collection and participant observation methods to gather data that are then interpreted through critical policy analysis. The research shows that Kazakhs have been racialized based on their mobile pastoral traditions, enslaved in the “debt economy,” and exploited through husbandry policies and programs. The particular ways in which husbandry has been restructured and assimilated into Chinese industrial production chains exploit and reproduce the Kazakh-Han hierarchy and segregation. This close look at racial capitalism in Altay sheds light on the operations of Xi’s ecological civilization and war on poverty policies in an ethnic minority border region and discusses how they align with the broader geopolitics of the Belt and Road Initiative in Central Asia and Eastern Europe.
In this article, we analyze the influence of the colonial policy of the Russian Empire and the Soviet Union on Ukrainian art-historical writing. As we shall reveal, the mechanisms of knowledge production created during that period continued to operate after the Declaration of Independence of Ukraine in 1991. The limitations that were imposed on the art-historical community, which can be regarded as colonial, shaped the crucial narratives (of the “triune nation”) and dictated the thematic scope of Ukrainian scholarship. The new notion of “mysteztvoznavstvo,” introduced in 1937 instead of the previously established Theory and History of Art, eventually led to a profound rift between Soviet Russian and Ukrainian scholarship and the Western world more generally. “Mysteztvoznavstvo” was supposed to be an umbrella term for art history, theory, and art criticism but ended up doing a disservice to each domain. Art theory in Ukraine was virtually nonexistent, whereas art history was mixed with art criticism, resulting in writing that did not meet widely accepted academic standards. This led to the isolation of Ukrainian scholars, who were confined to the Russian-speaking community and had very limited access to foreign scholarship. We also analyze the decolonization processes in the history of Ukrainian art prompted by the invasion of the Russian Federation into Ukraine after 2013, such as The Revolution of Dignity and “decommunization.” We argue that horizontal art history and decolonial approaches cannot adequately be applied if colonial tools are still used by the discipline. Epistemic decolonization can only be achieved after challenging the standards of “mysteztvoznavstvo” and, thus, by dividing art studies into three separate domains: art history, art theory, and art criticism, as each discipline has its own goals and methods.
When do political transitions lead to greater inclusion for groups historically excluded from power? Scholars and policymakers often assume the answer is simple: a transition will result in more inclusion when it ends in democracy. Yet this answer is incomplete at best, since many democracies systematically exclude women, particular ethnic groups, or lower economic classes from power. Using data on political transitions around the world from 1945 to 2014, this study shows that a political transition’s initiating force critically shapes post-transition political inclusion. When transitions are initiated through unarmed civil resistance campaigns they achieve greater advances in inclusion relative to other types of transition. We propose three mechanisms to explain this effect: civil resistance leads to greater continued mobilization and civic activism among the historically excluded, provides greater opportunities for elites from historically excluded groups to rise to positions of leadership in new regimes, and forges more pluralistic norms of political behavior.
Migraine can affect adults during their most productive years, yet few studies in Canada have examined the relationship between migraine-related disability and productivity loss. In particular, the impact of migraine on unpaid productivity loss has not been quantified.
Methods:
In this cross-sectional study, employed adults living with migraine were recruited from across Canada to complete a web-based questionnaire. Migraine-related disability was assessed using the Migraine Disability Assessment questionnaire, and productivity loss was evaluated using the Valuation of Lost Productivity questionnaire. Multiple regression models were used to quantify the association between migraine-related disability level and productivity loss after adjusting for relevant clinical, occupational and sociodemographic covariates.
Results:
There were 441 participants, of which 60.1% were female, and the mean (SD) age was 37.7 (10.9). Compared to participants with little to no migraine-related disability, hours of total productivity loss were higher among those with moderate disability (54.1 [95% CI: 10.2–98.1] adjusted hours per 3 months) and severe disability (110.5 [95% CI: 65.5–155.6] adjusted hours per 3 months); paid productivity loss was higher among participants with moderate disability (32.4 [95% CI: 3.1–61.8] adjusted hours per 3 months) and severe disability (61.6 [95% CI: 31.5–91.7] adjusted hours per 3 months); and unpaid productivity loss was greater in those with severe disability (43.5 [95% CI: 12.7–74.3] adjusted hours per 3 months).
Conclusions:
Greater migraine-related disability was associated with more total, paid and unpaid productivity loss among employed adults. These data will be valuable when evaluating the cost-effectiveness of emerging migraine therapies.
Many Royal College of Physicians and Surgeons of Canada (RCPSC) graduates in neurosurgery face significant challenges in finding full-time employment. The current study describes the career outcomes of neurosurgery residents from Canadian programs.
Methods:
All RCPSC neurosurgery graduates (n = 106) who completed their residency between 2015 and 2020 were included in this study. Baseline characteristics were determined for the entire cohort and then stratified by employment status. Several logistic regression models were used to identify predictors of full-time employment after residency.
Results:
Overall, 26.4% of neurosurgery graduates from 2015 to 2020 have been underemployed, defined as locum and clinical associate positions (6.6%), the pursuit of multiple fellowships (16%) and career change/nonsurgical career (3.8%). Only 52.0% of graduates were fully employed in Canada, with 30.2% appointed at academic institutions. Skull-base/open vascular (OR: 0.055, 95%CI [<0.01, 0.74]) and general neurosurgery (OR: 0.027, 95% CI [<0.01, 0.61]) fellowships were associated with underemployment. Advanced research degrees (master’s or Ph.D.) and sex were not associated with full-time employment.
Conclusions:
Over one-quarter of recent Canadian neurosurgery graduates were underemployed, and nearly half do not find employment in Canada. These results reflect a concerning reality for current and prospective neurosurgery graduates in Canada and will hopefully serve as a call to action for the Canadian neurosurgery community.
The gut microbiome is impacted by certain types of dietary fibre. However, the type, duration and dose needed to elicit gut microbial changes and whether these changes also influence microbial metabolites remain unclear. This study investigated the effects of supplementing healthy participants with two types of non-digestible carbohydrates (resistant starch (RS) and polydextrose (PD)) on the stool microbiota and microbial metabolite concentrations in plasma, stool and urine, as secondary outcomes in the Dietary Intervention Stem Cells and Colorectal Cancer (DISC) Study. The DISC study was a double-blind, randomised controlled trial that supplemented healthy participants with RS and/or PD or placebo for 50 d in a 2 × 2 factorial design. DNA was extracted from stool samples collected pre- and post-intervention, and V4 16S rRNA gene sequencing was used to profile the gut microbiota. Metabolite concentrations were measured in stool, plasma and urine by high-performance liquid chromatography. A total of fifty-eight participants with paired samples available were included. After 50 d, no effects of RS or PD were detected on composition of the gut microbiota diversity (alpha- and beta-diversity), on genus relative abundance or on metabolite concentrations. However, Drichlet’s multinomial mixture clustering-based approach suggests that some participants changed microbial enterotype post-intervention. The gut microbiota and fecal, plasma and urinary microbial metabolites were stable in response to a 50-d fibre intervention in middle-aged adults. Larger and longer studies, including those which explore the effects of specific fibre sub-types, may be required to determine the relationships between fibre intake, the gut microbiome and host health.
Interface-resolved direct numerical simulations (DNS) of clustered settling suspensions in a periodic domain are performed to study the filtered drag force for clustered particle-laden flows. Our results show that, for the homogeneous system, the filtered drag is independent of the filter size, whereas for the clustered particle-laden flows, the averaged drag becomes smaller than the homogeneous drag at the filter size above 4 particle diameters. The drag reduction saturates at the filter size being comparable to the cluster size in the horizontal direction in our simulations. A new correlation is proposed to account for the mesoscale effect on the filtered drag force by using drift velocity and variance of the solid volume fraction, based on the modification of existing subgrid drag models for the inhomogeneous system. The existing models for the drift velocity and the variance of the solid volume fraction are assessed using our DNS data. A new model for the drift velocity and the variance of the solid volume fraction is proposed, based on the combination and modification of the previous models. All mesoscale models considered can predict well the filtered drag with comparable accuracy, and are superior to the homogeneous drag model for the clustered system. Our models with the same parameter values obtained from the large-scale system can also predict well the filtered drag for smaller computational domain sizes.
Until now the research has mainly examined visible abusive supervision, like aggression and violence, but it’s unclear how subtle forms, such as gaslighting, impact victims. Gaslighting, an emotionally and psychologically manipulative form of abuse, is an increasingly prevalent phenomenon in contemporary times. Based on the conservation of resources theory, we examined how supervisory gaslighting affects job embeddedness directly and indirectly through work motivation. We also explored how coworker support moderates the gaslighting-work motivation link. Structural equation modeling was used to assess the two-wave time-lagged data from 337 Chinese hotel employees. The results show the negative direct and indirect effects of gaslighting, and coworker support moderates the negative link between gaslighting and work motivation. Hotel organizations should exercise caution when hiring supervisors to prevent gaslighting, which can undermine employee motivation and job embeddedness. This study also recommends raising awareness among employees to speak out against supervisors’ gaslighting behavior.
Motor neuron disease (MND) is a progressive, fatal, neurodegenerative condition that affects motor neurons in the brain and spinal cord, resulting in loss of the ability to move, speak, swallow and breathe. Acceptance and commitment therapy (ACT) is an acceptance-based behavioural therapy that may be particularly beneficial for people living with MND (plwMND). This qualitative study aimed to explore plwMND’s experiences of receiving adapted ACT, tailored to their specific needs, and therapists’ experiences of delivering it.
Method:
Semi-structured qualitative interviews were conducted with plwMND who had received up to eight 1:1 sessions of adapted ACT and therapists who had delivered it within an uncontrolled feasibility study. Interviews explored experiences of ACT and how it could be optimised for plwMND. Interviews were audio recorded, transcribed and analysed using framework analysis.
Results:
Participants were 14 plwMND and 11 therapists. Data were coded into four over-arching themes: (i) an appropriate tool to navigate the disease course; (ii) the value of therapy outweighing the challenges; (iii) relevance to the individual; and (iv) involving others. These themes highlighted that ACT was perceived to be acceptable by plwMND and therapists, and many participants reported or anticipated beneficial outcomes in the future, despite some therapeutic challenges. They also highlighted how individual factors can influence experiences of ACT, and the potential benefit of involving others in therapy.
Conclusions:
Qualitative data supported the acceptability of ACT for plwMND. Future research and clinical practice should address expectations and personal relevance of ACT to optimise its delivery to plwMND.
Key learning aims
(1) To understand the views of people living with motor neuron disease (plwMND) and therapists on acceptance and commitment therapy (ACT) for people living with this condition.
(2) To understand the facilitators of and barriers to ACT for plwMND.
(3) To learn whether ACT that has been tailored to meet the specific needs of plwMND needs to be further adapted to potentially increase its acceptability to this population.
James Dominic argues in response to a previous article by me that the view according to which God is the formal cause of creatures is unorthodox and ultimately incoherent. This is because it involves either making God a part of creatures, or dividing God into finite parts, both of which, he claims, lead to contradictions with traditional Christian claims. However, Rooney both misunderstands central parts of my presentation, and fails to make his case.
Crafting is often assumed to have been a ‘dirty’ and hence low-status activity: elites managed the supply of materials or distribution of the products, lower-status workers undertook the hard graft. Here, the authors present an in situ stoneworking toolkit from El Perú-Waka’ in the central Maya lowlands of Guatemala. Recovered from a high-status neighbourhood, the tools indicate the involvement of elite crafters in the working of various types of stone and greenstone. The assemblage is discussed with reference to ontological understandings of raw materials in the Maya world and the importance of specialised and ritual knowledge. The results encourage greater consideration of the involvement of elites in craft production across Mesoamerica and beyond.